01/01: utils: Add helper for invoking programs.

[Danny Milosavljevic]

dannym pushed a commit to branch core-updates
in repository guix.

commit 3f65c190d23296e7e718c3deff413e8beb61d8ba
Author: Danny Milosavljevic <address@hidden>
Date:   Thu Jun 1 19:04:10 2017 +0200

    utils: Add helper for invoking programs.
    
    * guix/build/utils.scm (invoke): New variable.
    
    Co-authored-by: Ludovic Courtès <address@hidden>
---
 guix/build/utils.scm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/guix/build/utils.scm b/guix/build/utils.scm
index 6d3c29d..7391307 100644
--- a/guix/build/utils.scm
+++ b/guix/build/utils.scm
@@ -84,6 +84,7 @@
             fold-port-matches
             remove-store-references
             wrap-program
+            invoke
 
             locale-category->string))
 
@@ -579,6 +580,15 @@ Where every <*-phase-name> is an expression evaluating to 
a symbol, and
     ((_ phases (add-after old-phase-name new-phase-name new-phase))
      (alist-cons-after old-phase-name new-phase-name new-phase phases))))
 
+(define (invoke program . args)
+  "Invoke PROGRAM with the given ARGS.  Raise an error if the exit
+code is non-zero; otherwise return #t."
+  (let ((status (apply system* program args)))
+    (unless (zero? status)
+      (error (format #f "program ~s exited with non-zero code" program)
+             status))
+    #t))
+
 
 ;;;
 ;;; Text substitution (aka. sed).